Humans have been looking up at the starry sky for a long time, and myths and legends about the moon have existed since ancient times. But it was not until 400 years ago that Galileo aimed his telescope at the starry sky for the first time that we really began to look up at the starry sky and understand the starry sky scientifically. Half a century ago, the space race between the United States and the former Soviet Union promoted the rapid development of mankind in the space field. From the end of 19 to the beginning of the 20th century, NASA carried out seven manned missions to the moon, from Apollo 1 1 to Apollo 17.
Of course, Apollo 13 failed, but it still succeeded in sending 12 astronauts to the surface of the moon six times. No other species has done such a feat, only humans have done it. It seems that biological evolution has only developed sharp teeth and claws and strong bodies, and none of them has advantages over the evolution of the brain. The moon is tidal locking by the earth, so only the front is always facing the earth. For hundreds of thousands of years, mankind never witnessed the true face of the back of the moon until the Soviet Union launched it on June 4, 1959. Moon 3? It is the first time to take pictures of the back of the moon, and it is the first time to see the back of the moon in human history. But it looks vague, which makes the back of the moon, which is already mysterious, even more mysterious.
But since then, astronauts have witnessed the back of the moon in the early stage of the Apollo program, unlike us? Alien base? . 20 1913 October, 65438+2009, Chang 'e IV, which has been flying for 25 days, successfully landed on the back of the moon. This is the first lunar exploration in human history, and the technical difficulty is very great. The landing site of Chang 'e IV is Feng in aitken Basin. Carmen Crater, this is the back of the moon near the South Pole. This crater is very large, with a diameter of 2500 kilometers and a depth of over 13 kilometers. The reason for landing here is to find the deep material of the moon and judge its internal structure. This crater is very old, formed 4.2 billion years ago, and may contain the secrets of the formation of the solar system and the origin and evolution of the moon.
Early NASA lunar probes also found magnetic anomalies and gravity anomalies in this area. Under this area, a huge dense metal object is buried, weighing 2 1.8 trillion tons and covering an area of over 50,000 square kilometers. And it may be rich in metal substances such as iron and titanium, and the depth under the moon is more than 300 kilometers.
Scientists have always wondered why there are such large metal objects under the moon. Is it really the fantasy of the people who eat melons? Is the moon an abandoned spaceship? But this statement is only active in stall magazines, and mainstream science does not support this theory at all. Scientists speculate that this metal body under the moon may be related to celestial impact. Shortly after the formation of the moon, an asteroid hit the surface of the moon and formed a huge impact crater. At the same time, through continuous deposition, the metal substance of this asteroid entered the moon. Of course, there is also a saying that there was once a planet about the size of Mars? Taiya. It collided with the earth, and finally a large number of fragments combined to form the moon, because a series of actions at the beginning of its formation eventually produced titanomagnetite.
So why can't this huge metal object buried under the moon be left by ancient civilization? Perhaps there are other civilizations on the moon that have established bases, and over time, they were finally sealed and bought underground. Of course, this statement is more sci-fi and there is not enough evidence to prove it.